Chisel



N. A. SHERIDAN CHISEL Oct. 17, 19 39,

Filed March '7, 1939 I INVENT OR.

Z ATTORNEYS Patented Oct. 17, 1939 UNITED STATES PATENT OFFICE CHISELNicholas A. Sheridan, Flushing, N. Y. Application March '1, 1939, SerialNo. 266,286

My invention relates to a new and improved combination chisel and guard.

One of the objects of my invention is to provide a device in which asuitable guard is connected movably to a chisel, so as to provide acombination tool, thus making it unnecessary to apply the guard to thechisel when it is desired to use the chisel.

Another object of the invention is to provide a combination tool andguard which will be particularly useful in transversely cutting roundpipe and the like.

Another object of the invention is to provide a guard which is connectedmovably to a chisel so as to facilitate the transverse cutting of roundpipe.

Other objects of my invention will be set forth in the followingdescription and drawing which illustrate a preferred embodiment thereof,it

if) being understood that the above statement of the objects of myinvention'is intended generally to explain the same without limiting itin any manner.

Fig. 1 is a side elevation of the improved tool, part of therepresentation of the guard being broken away so as to illustrate theguard more clearly. In this figure the full-line position of the guardshows the operative position thereof and the broken-line position of theguard shows the so inoperative position thereof.

Fig. 2 is a sectional view on the line 2-2 of Fig. 1.

Fig. 3 is a bottom plan view of Fig. 1.

a Fig. 4 is aside elevation of the guard, taken at the right-hand sideof Fig. 1. I

The device includes a chisel l which is suitably connected to a handle2. The chisel I has the I usual cutting edge 3. As shown in Fig. 2, the

chisel I is provided with a lateral bore 4. The

shield or guard 5 is made of any suitable metal.

It is provided with lugs 6 having slots or perforations 1. A pivot pin 8extends through the perforations I and the bore 4. The pivot pin 8 isprovided at one side thereof with a head whose diameter exceeds thewidth of the adjacent slot I. The other end of the pivot pin 8 isprovided with a cotter-pin 9 or other suitable device for maintainingthe assembly between the parts.

As shown in Fig. l, the slots I are of general 5 rectangular shape. Theheight of each slot 1 is greater than the width thereof. The lugs 6extend above the front or left-hand wall of the guard 5, referring toFig. 1. The rear or righthand side of the guard 5, referring to Fig. 1does 55 not have a lateral wall. when the shield is in the full-lineposition shown in Fig. 1, there ,is a clearance between the left-handwall of the chisel and the adjacent edge of the left-hand wall of theguard 5. The guard 5 can therefore be turned to the broken-line positionshown in Fig. I' 1. The guard can also have a limited up-anddownmovement relative to the chisel, since the 5:11:15 of the pivot pin 8 iseasily movable in the s o a In using the device, the bottom edge-wallsof 'U the guard are placed upon the surface of the pipe which is to becut. One man holds the handle 2 and another man strikes the head of thechisel with a hammer. The chisel I and its pivot pin 8 can then movedownwardly relative to the ll guard so as to cut the pipe under theblows of the hammer. In cutting cast-iron pipe, chips of the metal ofthe pipe are frequently thrown with tremendous force under the blow ofthe chisel and these flying chips have frequently caused very Q seriousaccidents. The improved device prevents this. Likewise the guard isfreely movable and rotatably adjustable relative to the chisel. Hencethe guard can readily adjust itself to the curvature of the "pipe, eventhough its bottom edgeu walls are planar. Since the guard is assembledwith the chisel, it is impossible for a negligent workman to use thechisel without the guard.

The device can be manufactured very simply and it can be manufactured atvery low cost and so the .use thereof will result in a great reductionin serious accidents.

When the guard hangs, freely from the chisel, the bottom edge-walls ofthe guard are located below the cutting edge of the chisel. The upper 35edge of the left-hand wall of the guard then abuts the left-hand wall ofthe chisel so that the longitudinal axes of the slots 1 are thensubstantially vertical. The pivot pin I may be turnable relative to thechisel t. o

The width of the tapered portion of the chisel is preferably less thanthe distance between the inner surfaces'of the opposed side walls of theguard, so that the guard can be shifted sideways relative to the chisel.u

The invention can be applied to any type of chisel, including thediamond point chisel.

I have shown a preferred embodiment of my invention, but it is clearthat numerous changes and omissions can be made therein withoutdeparting from its spirit.

I claim:

1. A chisel having a cuttingv edge and a pin extending transverselythrough said chisel and perpendicular to said cutting edge, a guardhaving 5 slotted portions, said pin extending through said slottedportions and holding the guard movably assembled with the chisel, saidguard being pivwalls and a front wall, said guard being open at I itsrear end, said guard having lugsextending above the front wall thereof,said lugs having vertical slots, said slots being dimensioned so thatthe guard can be moved up-and-down and also turned relative to thecutting edge of the chisel, said pin supporting the guard pivotallyrelative to the chisel, so that the guard can be i turned relative tothe-chisel about the axis of the pin.

3. In combination with a chisel having a cutting edge, a guard, pivotmeans connecting said guard turnably to said chisel, the axis of saidpivot means being transverse to said cutting edge, the guard and thechisel being also movable relative to each other up and down relative tosaid cutting edge.

NICHOLAS A. SHERIDAN.

